You are given Ka of carbonic acid is 4.3 x10^-7. This means that Carbonic acid is a
good hydrogen-ion acceptor***
good hydrogen-ion donor
poor hydrogen-ion acceptor
poor hydrogen-ion donor
Nope. Think, it is a weak acid.
so C?
Kayla: What is the definition of an acid? It is not an H3O+ acceptor. Goodness.
HA>>H+ + A-
To determine whether carbonic acid is a good hydrogen-ion acceptor or donor, we need to understand the concept of acid dissociation constant (Ka).
The acid dissociation constant (Ka) measures the extent to which an acid donates hydrogen ions (H+) in a solution. A high Ka value indicates that the acid donates a greater number of hydrogen ions and is therefore a good hydrogen-ion donor. Conversely, a low Ka value indicates that the acid donates fewer hydrogen ions and is a poor hydrogen-ion donor.
Carbonic acid (H2CO3) can undergo dissociation to release hydrogen ions:
H2CO3 ⇌ H+ + HCO3-
Given that the Ka of carbonic acid is 4.3 x 10^-7, we can conclude that it is a poor hydrogen-ion donor. This is because a smaller Ka value implies a weaker acid and a lower concentration of hydrogen ions in solution.
Therefore, the correct answer is: poor hydrogen-ion donor.